找规律题选最合适的填补3/8,1/9,3/64,3/125,() A.1/81 B.1/63 C.1/90 D.1/721,11,13,23,25,35,(),47A.64 B.56 C.42 D.37

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/06 13:17:42

找规律题选最合适的填补3/8,1/9,3/64,3/125,() A.1/81 B.1/63 C.1/90 D.1/721,11,13,23,25,35,(),47A.64 B.56 C.42 D.37
找规律题选最合适的填补
3/8,1/9,3/64,3/125,()
A.1/81 B.1/63 C.1/90 D.1/72
1,11,13,23,25,35,(),47
A.64 B.56 C.42 D.37

找规律题选最合适的填补3/8,1/9,3/64,3/125,() A.1/81 B.1/63 C.1/90 D.1/721,11,13,23,25,35,(),47A.64 B.56 C.42 D.37
D,
因为其实分子一直是3,分母依次是2的三次方,3的三次方,4的三次方,5的三次方,6的三次方.
分奇偶项等差数列
11-1=10
13-11=2
23-13=10
25-23=2
35-25=10
37-35=2
47-37-10
所以选D